Redirect user from IDM UI after logoff

Hi experts,

we are running idm 7.2 sp8 and AS java 7.0.

Our customer would like to redirect the end users to another webpage right after loging off from idm web ui.

I found that the ume.logoff.redirect.url parameter would be the one to use in my case

Logoff - Using Java - SAP Library

Configuring the Portal Logoff URL - Portal - SAP Library

But after some tests by the netweaver admin, it seems to be working only with "real" EP pages (/irj)

Have anyone managed to do it with a /idm or /idm/admin page and if so, using this parameter or doing something else?

Thanks a lot,

Clotilde